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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09f758333f7c963576c07ae5d51c865e762486e2a2d9a922c1eee4399bff0793' 
  AND token = 'JVEX9wwhfIrF9DKMeA6Z7UaTOwN5FmciZyO3jqr8HK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}